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Miosis

by Teri Robert
for About.com

About.com Health's Disease and Condition content is reviewed by the Medical Review Board

Definition: Abnormal contraction of the pupils, possibly due to irritation of the oculomotor system or paralysis of the dilators.
Common Misspellings: myosis
Examples: Miosis can occur as a symptom of cluster headache, a Migraine attack, stroke, or as an effect of some medications.
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